一体化磁梯度系统误差补偿算法

Integrated Error Compensation Algorithm for Magnetic Gradient System

摘要:

磁梯度测量系统对传感器的一致性、测量精度、以及装配技术都有很高的要求，已有的误差补偿方法在磁梯度张量误差过程中，分别对磁力仪的测量误差、磁力仪之间的对准误差以及运动平台产生干扰磁场进行补偿，但是系统在长时间的工作后，标定参数必然发生变化，对于成熟装备如果要拆开装备并重新逐步校正必然浪费极大的人力物力。针对上述问题，提出了一种简便可行的一体化磁梯度张量系统误差补偿算法，仿真结果表明：对于十字形磁梯度张量测量系统，校正后误差降低到校正前误差的 8%以下，能够有效克服磁梯度系统测量信号畸变所带来的不利影响。

Abstract:

Magnetic gradient measurement system has high requirements for sensor consistency，measurement accuracy，and assembly technology. In the process of magnetic gradient tensor error，the existing error compensation methods would compensate the measurement error of magnetometer，the alignment error between magnetometers， and the interference magnetic field generated by motion platform. However，after a long time of work，the calibration parameters will inevitably change，and it would take a lot of manpower and materials to dismantle the mature equipment and make calibrations gradually. In view of the above problems，this paper proposes a simple and feasible integrated error compensation algorithm for the magnetic gradient tensor system. The simulation results show that for the cross shaped magnetic gradiometer，the error after calibration is reduced to less than 8% of that before calibration，which can effectively overcome the adverse effects of the magnetic gradient signal distortion.